The British Royal Family is the group of close relatives of the monarch of the United Kingdom. The term is also commonly applied to the same group of people who are the relations of the monarch in her or his role as sovereign of any of the other Commonwealth realms, thus sometimes at variance with official national terms for the family.[1] Members of the Royal Family belong to, either by birth or marriage, the House of Windsor, since 1917, when George V changed the name of the royal house from Saxe-Coburg and Gotha. This decision was primarily taken because Britain and her Empire were at war with Germany and given the British Royal Family's strong German ancestry; it was felt that its public image could be improved by choosing a more British house name. The new name chosen, Windsor, had absolutely no connection other than as the name of the castle which was and continues to be a royal residence. Source: Wikipedia